<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let arr = [];
      let max = arr[0];
      for (let i = 1; i <= 3; i++) {
        let num = +prompt(`请输入第${i}个数`);
        arr.push(num);
      }
      for (let i = 0; i <= arr.length; i++) {
        if (arr < arr[i]) {
          max = arr[i];
          alert(max);
        }
      }

      //   console.log(max);
    </script>
  </body>
</html>
